I don't mean to be a monkey wrench in the gears, but I think the weight loss demonstrated by Jesslyn is mostly due to the type of mass she had. Most of us have a significant amount of this hard to shed male muscle, but in order to get to that original size, it generally takes protein binges and/or chemicals like creatine (which gives you a sort of "water weight"). I had also massed up quite a bit from following those diet routines and heavy weights, but every bit of it melted right off when I stopped taking supplements, and only work out as maintenance. Now I look like I have for years prior to lifting, but I'm not on HRT yet so I can't say that it won't disappear, here's to hoping.
EDIT: I was watching some of her videos and I see steroids were also involved, so that was definitely not natural bulk (not to diminish how hard it has to be on her), if you got that big naturally, it may require much more effort on your part to limit protein intake and find some method of "melting" the muscle off.